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CPM OPERATING SYSTEMS/CPM 3.X/CPM 3.0/3ON2/HBIOS.ASM

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+;--------------------------------------------------------
+;
+;	PROGRAM ID:	GBIOS3.ASM
+;			GENERIC LOADER AND BIOS FOR CP/M PLUS
+;			FOR CP/M-80 V2.2 SYSTEMS
+;			UNBANKED
+;			NO HASHING
+;			BIOS PERFORMS BLOCKING/DEBLOCKING
+;
+;--------------------------------------------------------
+;
+;	ORGANIZATIONAL COMMENTARY
+;
+;--------------------------------------------------------
+;	This BIOS is designed to be the user's first step
+;in making an upgrade from CP/M-80 v2.2 to CP/M Plus v3.0.
+;This BIOS will function properly in most CP/M-2 systems,
+;even those with the BIOS in PROM.
+;
+;FUNCTION:
+;	This PROGRAM implements an UNBANKED, NON-HASHED,
+;UNBUFFERED BIOS for CP/M Plus version 3.0.
+;
+;METHOD:
+;	CP/M Plus allows many levels of sophistocation in
+;the implementation of the BIOS.  At the highest levels,
+;the BIOS allows CP/M Plus to manage a potentially large
+;memory pool which acts like an instant access disk drive;
+;a substantial performence enhancement.  At the lowest level,
+;the performance of CP/M Plus is the same as that of CP/M-80
+;version 2.2.  This interface program is a simple implementation
+;of a CP/M Plus BIOS which operates as a parasite to the user's
+;existing BIOS for CP/M-80 version 2.2.
+;
+;PURPOSE:
+;	This BIOS allows the CP/M-80 v2.2 user to easily
+;upgrade to CP/M Plus v3.0 and enjoy its logical enhancements
+;at the same level of performance he has enjoyed with v2.2.
+;This BIOS can be an end-point since system performance
+;will be satisfactory.  For users who own the hardware
+;required to implement hashing and buffering, this BIOS
+;will serve as a welcome starting point for further enhancement.
+;
+;ORGANIZATION:
+;	This BIOS is organized as follows:
+;
+;	CONSTANTS
+;	CONFIGURATION CONSTANTS AND CONDITIONS  ***
+;	EXTERNAL REFERENCES
+;	PUBLIC DECLARATIONS	(NULL)
+;	RAM DEFINITIONS
+;	CP/M 2.2 LINKAGE EQUATES
+;
+;	CP/M PLUS JUMP TABLE
+;	INITIALIZATION PROCESSES
+;	LOCAL AND NULL PROCESSES
+;	SIMPLE INDEXED PROCESSES
+;	COMPLEX INDEXED PROCESSES
+;	LOCAL SUBROUTINES
+;	INITIALIZED STORAGE
+;	UNINITIALIZED STORAGE
+;	END
+;
+;	***	edit these
+;--------------------------------------------------------
+;
+;	OPERATIONAL COMMENTARY
+;
+;--------------------------------------------------------
+;
+;	Digital Research owes much of its success to the
+;foresight of its operating system designers who have seen
+;fit to make their products upward compatible with one
+;another.  CP/M Plus is no exception, and so it is no
+;surprise that the CP/M Plus BIOS shares many constructs
+;with the earlier CP/M-80 v2.2.
+;
+;	The CP/M Plus BIOS implements 32 entry points in
+;its jump table.  Of these, the first 17 correspond to the
+;17 entries in the CP/M-80 v2.2 jump table.  14 of these
+;are treated as identical to those in 2.2.  These index
+;directly into the 2.2 jump table.  The remaining three in the
+;2.2 set are BOOT, which is null, WBOOT, which loads CCP.COM,
+;and SELDSK which creates all of the necessary disk data
+;structures required by CP/M Plus based on those in the 2.2 BIOS.
+;The remaining 15 entries in the CP/M Plus BIOS, with the
+;single exception of MOVE, are implemented in one of
+;the following ways:
+;
+;	1.)	null, simply return.
+;	2.)	nearly null, do something really simple.
+;	3.)	tell a white lie.
+;
+;--------------------------------------------------------
+;
+;	constants
+;
+;--------------------------------------------------------
+;--------------------------------------------------------
+;
+;	configuration constants and conditions
+;
+;--------------------------------------------------------
+;ldrbios	equ	true
+;--------------------------------------------------------
+;
+;	external references
+;
+;--------------------------------------------------------
+;--------------------------------------------------------
+;
+;	public declarations
+;
+;--------------------------------------------------------
+;
+;currently null
+;
+;--------------------------------------------------------
+;
+;	ram definitions
+;
+;--------------------------------------------------------
+;--------------------------------------------------------
+;
+;	cp/m v2.2 linkage equates
+;
+;--------------------------------------------------------
+;--------------------------------------------------------
+;
+;	cp/m plus version 3.0 jump table
+;
+;--------------------------------------------------------
+;	org	(bios-(200h+64*drives)) and 0ff00h
+;
+;
+;
+;--------------------------------------------------------
+;
+;	initialization processes
+;
+;--------------------------------------------------------
+;
+;	initialize low memory jumps
+;
+;
+;	load ccp.com into tpa
+;
+;
+;	the load loop
+;
+;
+;
+;
+;
+;--------------------------------------------------------
+;
+;	local and null processes
+;
+;--------------------------------------------------------
+;	z80 users may code as:
+;	xchg
+;	db	0edh,0b0h	;ldir
+;	xchg
+;	ret
+;
+;--------------------------------------------------------
+;
+;	simple indexed processes
+;
+;--------------------------------------------------------
+;--------------------------------------------------------
+;
+;	complex indexed functions
+;
+;--------------------------------------------------------
+;--------------------------------------------------------
+;
+;	local subroutines
+;
+;--------------------------------------------------------
+;--------------------------------------------------------
+;
+;	initialized storage
+;
+;--------------------------------------------------------
+;--------------------------------------------------------
+;
+;	uninitialized storage
+;
+;--------------------------------------------------------
+;--------------------------------------------------------
+;cp/m is a registered trademark of digital research, inc.
+;you already knew that, but they wanted us to remind you.
+;--------------------------------------------------------
+